B - Operations – Transporting – 63 – B
Patent
B - Operations, Transporting
63
B
114/9
B63B 25/08 (2006.01) B63B 11/04 (2006.01)
Patent
CA 1120336
ABSTRACT OF THE DISCLOSURE A plurality of narrow ballast tanks arranged around the periphery of diaphragms such as those disclosed in the inventor's U.S. Patent No. 4,117,796 "Double Sectioned Tank". The peripheral ballast tanks facilitate the construction, installation, operation, and maintenance of the diaphragms that segregate the cargo oil from the ballast water in the oil tanker in which they are fitted, and allow the tanker in which they are fitted to carry substantially more cargo than an identical externally dimensioned standard segregated ballast tanker. The peripheral ballast tanks, which are located in the lower portion of the cargo tanks, in general are built along the longitudinal and transverse bulkheads and ship's sides, but they can also be arranged to sub-divide the lower portion of large cargo tanks, they, in effect, form a tank grid about the lower portion of the cargo tanks space, with the cells in the grid being suitable for the reception of the diaphragms. The diaphragms each consist of three main parts: (a) a vertically movable thin and flat partition, that can, if required, be buoyant in order that it may float on ballast water; (b) a mating but fixed partition rim fitted outside of the movable partition, as described below; (c) an elastomeric membrane sheet that is fitted between and attached to the movable partition in such a manner that the complete diaphragm forms an impervious barrier to oil or water attempting to pass from top to bottom or vice versa. Movable partition guide and securing means are also provided. By locating the fixed partition rim at mid-point of the movable partition travel on the sides of the peripheral ballast tanks, major savings of membrane material can be achieved. Compensatory steelwork can be built into the peripheral ballast tanks to replace material and structural strength lost due to steelwork removed to make room for the installation and operation of the segregating diaphragm. The peripheral tanks on the tanker's side, if of the required width, will be "protective ballast space" when the tanker is in the cargo loaded condition, as will the double bottom space beneath the diaphragm, if it is of suitable height. - 2 -
347444
Kent & Edgar
Strain Patrick J.
LandOfFree
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